Question about Bromthymol blue

[DustMolecule]

My daughter is doing a science project about global warming/greenhouse gases. We ordered some bromthymol blue to use as the indicator (per the project instructions). Well, it came today and it's uhm, kind of a reddish/orange color in the bottle. I guess, silly me, I was expecting it to be BLUE! (According to the project instructions, it sounds like it should be blue.) Is this stuff that I got okay or what?

Any insight into this little boulder on our 'path to science enlightenment' would be appreciated. :-)

edit: typo

[Wonk]

1. That's for testing pH, right?

I'm guessing if it's not blue anymore it's been exposed to something acidic along the way?

High school chem was many moons ago. You could try googling.

http://www.google.com/search?q=bromthymol+blue

[Philostopher]

2. Bromothymol blue is actually yellowish-orange

at one end of the PH spectrum, it turns blue at a different level of acidification. May have to do with the PH of the ambient solution.

It's probably okay as is -- it should change color when the PH changes, as far as I know.

[mike_c]

3. it changes to blue in basic soln....

Bromthymol blue is yellow below pH 9 or so, then turns blue at pH 9.0-ll.0, if I recall correctly. That's why it's an indicator soln.

[pk_du]

4. According to this its supposed to be yellow crystals

http://www.jtbaker.com/msds/englishhtml/b5380.htm

[pk_du]

5. Color change from yellow to blue at Ph 6.0-7.6

http://www.gfschemicals.com/chemicals/gfschem-2043.asp

[DustMolecule]

6. Ahhhhh.....Thank you all very much!

Thanks for the help :-)